129442388 has 6 divisors (see below), whose sum is σ = 226524186. Its totient is φ = 64721192.

The previous prime is 129442387. The next prime is 129442393. The reversal of 129442388 is 883244921.

It can be written as a sum of positive squares in only one way, i.e., 116683204 + 12759184 = 10802^2 + 3572^2 .

It is a super-2 number, since 2×129442388² = 33510663622285088, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129442387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16180295 + ... + 16180302.

It is an arithmetic number, because the mean of its divisors is an integer number (37754031).

Almost surely, 2^129442388 is an apocalyptic number.

It is an amenable number.

129442388 is a deficient number, since it is larger than the sum of its proper divisors (97081798).

129442388 is a wasteful number, since it uses less digits than its factorization.

129442388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32360601 (or 32360599 counting only the distinct ones).

The product of its digits is 110592, while the sum is 41.

The square root of 129442388 is about 11377.2750691895. The cubic root of 129442388 is about 505.8543691888.

The spelling of 129442388 in words is "one hundred twenty-nine million, four hundred forty-two thousand, three hundred eighty-eight".